Pin Ubuntu to 22 for firefox tests #10180

Job	Run time
Type Checking (current version)	1m 13s
Basic Test	1m 32s
Linting	1m 9s
Blueprint Tests	9m 45s
Type Checking (other supported versions) (4.9)	1m 3s
Type Checking (other supported versions) (5.0)	1m 5s
Type Checking (other supported versions) (5.1)	1m 6s
Type Checking (other supported versions) (5.2)	1m 13s
Type Checking (other supported versions) (5.3)	1m 2s
All deprecations enabled	1m 30s
Browserstack Tests (Safari, Edge)	5m 52s
Browser Tests (Firefox)	1m 50s
All deprecations enabled, with optional features	1m 37s
Node.js Tests	53s
Deprecations as errors	1m 39s
Deprecations as errors, with optional features	1m 29s
Production build	1m 37s
Smoke tests (Full Ember Apps) (classic-basics)	1m 29s
Smoke tests (Full Ember Apps) (embroider-basics)	1m 20s
Production build, with optional features	1m 27s
Publish channel to s3	1m 9s
Publish alpha from default branch	0s
Deploy tags to npm	0s
Notify Discord	0s
	41m 0s

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